Rapid and uniform heating system for hot oil of liquid cargo of oil tanker

Abstract

The invention relates to an oil tanker liquid cargo hot oil rapid and uniform heating system in the field of heating devices, which is characterized in that volatile oil gas accumulated at the top of a liquid cargo bin is injected into a discharge pipe through a sucking pump and a central gas injection pipe arranged in the discharge pipe, and crude oil which is being heated in the discharge pipe is subjected to airflow jet stirring; the heating uniformity and the heating efficiency are improved, meanwhile, the concentration of volatile oil gas formed by heating is reduced, and the safety of heating operation is improved; besides, the edge gas injection pipe close to the edge of the discharging pipe is arranged, volatile oil gas is injected to the inner wall of the discharging pipe, friction between the crude oil and the inner wall of the discharging pipe is reduced, the fluidity of the crude oil is further improved, and under the condition that the crude oil discharging viscosity is met, the power output of the heating device is reduced, and the energy efficiency is improved; in addition, through a bottom gas injection pipe and a guide plate, the floating heat exchange efficiency of crude oil on the outer side of the discharge pipe is improved, and the preheating effect is improved.

Description

Technical Field

[0001] The invention relates to a liquid cargo tank heating system, in particular to a rapid and uniform heating system for liquid cargo hot oil in an oil tanker applied in the field of heating devices. Background Art

[0002] In the operation of transporting high-viscosity crude oil by oil tankers, the traditional liquid cargo tank heating system adopts a bottom coil heat exchange device to evenly heat the entire tank. Its inherent process mode has dual technical defects: on the one hand, limited by the low thermal conductivity of crude oil and static storage conditions, the insufficient heat diffusion efficiency leads to a slow heating rate, which is difficult to match the timeliness requirements of port loading and unloading operations; on the other hand, the whole tank heating process will intensify the volatilization of light components of crude oil, causing volatile organic compounds (VOCs) to continue to accumulate in the gas phase space at the top of the liquid cargo tank, and its concentration may reach the critical threshold of the vapor explosion limit (LFL) of oil products (such as the LFL of typical crude oil is about 1.1% volume concentration), thereby significantly increasing the difficulty of implementing safety control measures such as tank gas replacement and inert gas covering during unloading operations, and posing a potential safety hazard to operations.

[0003] The existing patent with publication number CN220096625U discloses a system for rapid and uniform heating of liquid cargo hot oil of a product oil tanker, including a plurality of aluminum fin groups, which are vertically arranged at the bottom of the liquid cargo tank of the product oil tanker, and the plurality of aluminum fin groups are sequentially arranged in front and back intervals; a heating medium circulation group, the heating medium circulation group includes an inlet pipeline connected to the starting end aluminum fin group, an outlet pipeline connected to the end aluminum fin group, and a connecting pipeline connecting two adjacent aluminum fin groups, and also includes a heating medium box connected to the inlet pipeline and the outlet pipeline, and a circulating pump is provided in the heating medium box, and the inlet pipeline, the outlet pipeline, the plurality of aluminum fin groups and the heating medium box are connected to form a circulation channel. The utility model has the following advantages: improving heat transfer efficiency and realizing rapid and uniform heating.

[0004] The above-mentioned prior art improves the heat transfer efficiency by changing the distribution of fins and pipelines. However, the liquid cargo tank of an oil tanker is generally large in size. Increasing the distribution range of fins and pipelines not only increases the construction cost, but also affects the heat exchange efficiency due to excessively long pipelines. In addition, the increase in the concentration of volatile oil and gas caused by heating is not solved. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the traditional liquid cargo tank heating system has a slow heating speed and causes an increase in the concentration of volatile oil and gas.

[0006] In order to solve the above problems, the present invention provides a system for quickly and evenly heating hot oil of liquid cargo of an oil tanker, comprising a heating mechanism fixedly installed at the bottom of the liquid cargo tank and a controller equipped with a heating control system; the heating mechanism comprises a discharge pipe fixedly connected to the shell wall of the liquid cargo tank and extending at one end to the outside of the liquid cargo tank, an electric control oil valve is fixedly connected to the outer end of the discharge pipe, a flow gap for crude oil to enter is formed between the end of the discharge pipe away from the electric control oil valve and the inner wall of the liquid cargo tank, and a heating device is fixedly connected inside the shell wall of the discharge pipe;

[0007] A central air injection pipe extending to the outside of the liquid cargo tank is provided at the central axis position of the discharge pipe, and a first spray hole evenly distributed is provided in the portion of the central air injection pipe located in the discharge pipe. The central air injection pipe is fixedly connected to the shell wall of the liquid cargo tank and an air inlet pipe is connected to the outer end thereof, and the air inlet pipe is connected to an air pump fixed to the upper end surface of the liquid cargo tank, and the air pump is connected to the upper end of the inner cavity of the liquid cargo tank through the air suction pipe; a plurality of edge air injection pipes distributed circumferentially and close to the inner wall of the discharge pipe are provided in the discharge pipe, and the ends of the edge air injection pipes are connected to the central air injection pipe, and third spray holes evenly distributed are provided on the edge air injection pipes.

[0008] In the above-mentioned tanker liquid cargo hot oil rapid and uniform heating system, volatile oil gas is injected into the discharge pipe of the heated crude oil through the vacuum pump and the central gas injection pipe to reduce the concentration of volatile oil gas and start stirring the heated crude oil at the same time.

[0009] As a further improvement of the present application, the heating control system includes a control module, the input end of the control module is respectively connected to a temperature monitoring module, a viscosity monitoring module and a concentration monitoring module, the input end of the temperature monitoring module is connected to a temperature sensor, the temperature sensor is fixed on the shell wall of the discharge pipe close to the electric oil valve, the input end of the viscosity monitoring module is connected to a viscosity sensor, the viscosity sensor is fixed on the discharge pipe and arranged opposite to the temperature sensor, the input end of the concentration monitoring module is connected to a concentration sensor fixed on the top wall of the liquid cargo tank; the output ends of the control module are respectively connected to a heating module, a gas filling module and a unloading module, the output end of the heating module is connected to the heating device, the output end of the gas filling module is connected to the vacuum pump, and the output end of the unloading module is connected to the electric oil valve.

[0010] As a further improvement of the present application, the portion of the discharge pipe located in the liquid cargo tank is made of heat-conducting material, and a bottom gas injection pipe is provided below the discharge pipe, which is fixedly connected to the liquid cargo tank and extends to the outside of the liquid cargo tank. The bottom gas injection pipe is provided with fourth spray holes equidistantly distributed along its axial direction, and the outer end of the bottom gas injection pipe is connected to the air inlet pipe and an electromagnetic flow valve is provided at the connection point, and the electromagnetic flow valve is connected to the output end of the gas filling module.

[0011] As a further improvement of the present application, there are multiple first spray holes, and the central air injection tube has multiple first spray holes equidistantly distributed on the circumferential side wall at the same distance from its end, and the central air injection tube has multiple second spray holes in the part located in the flow gap, and the second spray holes are equidistantly distributed on the circumferential side wall of the central air injection tube.

[0012] As a further improvement of the present application, there are multiple third spray holes, the third spray holes are evenly distributed along the axial direction of the edge gas injection pipe and their openings face the inner wall of the discharge pipe.

[0013] As a further improvement of the present application, the heating device adopts one of a cylindrical heating plate or a spiral heating wire.

[0014] As a further improvement of the present application, the discharge pipe is a horizontally arranged hollow circular tube and is arranged along the length direction of the liquid cargo tank. The bottom air injection pipe is located directly below the discharge pipe and is arranged parallel to it. The fourth spray hole is vertically facing the outer wall of the discharge pipe.

[0015] As a further improvement of the present application, a group of relatively arranged guide plates are provided on the outside of the discharge pipe, and a circulation heat exchange channel is formed between the group of guide plates and the outer wall of the discharge pipe. The bottom air injection pipe is located at the lower center position of the group of guide plates, and the lower end of the guide plate is fixedly connected to the bottom plate of the liquid cargo tank through a support rod.

[0016] In summary, the present invention injects volatile oil gas accumulated on the top of the liquid cargo tank into the discharge pipe through an air pump and a central air injection pipe arranged in the discharge pipe, and performs air jet stirring on the crude oil being heated in the discharge pipe, thereby improving the fluidity of the crude oil, increasing the heat conduction efficiency inside the crude oil, improving the uniformity and heating efficiency of heating, and at the same time reducing the concentration of volatile oil gas formed by heating, thereby improving the safety of the heating operation; at the same time, by providing an edge air injection pipe close to the edge of the discharge pipe, the volatile oil gas is sprayed onto the inner wall of the discharge pipe, thereby reducing the friction between the crude oil and the inner wall of the discharge pipe, further improving the fluidity of the crude oil, and under the condition of meeting the viscosity of the crude oil unloading, reducing the output power of the heating device, thereby improving the energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the three-dimensional structure of this application;

[0018] Figure 2 This is a schematic diagram of the internal structure of the liquid cargo tank in this application;

[0019] Figure 3 This is a module schematic diagram of the heating control system of the present application;

[0020] Figure 4 This is a schematic diagram of the transverse cross-sectional structure of the present application;

[0021] Figure 5 for Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0022] Figure 6 This is a schematic diagram of the assembly structure of the central gas injection pipe and the edge gas injection pipe in this application;

[0023] Figure 7 This is a schematic diagram of the three-dimensional structure of the guide plate and the bottom air injection pipe in this application;

[0024] Figure 8 The schematic diagram of the flow of volatile oil gas and crude oil in the liquid cargo tank;

[0025] Figure 9 It is a schematic diagram of the flow of volatile oil gas and crude oil in the discharge pipe;

[0026] Figure 10 Schematic diagram of the flow of volatile oil and crude oil in the guide plate.

[0027] Description of the numbers in the figure:

[0028] 1. Liquid cargo tank; 2. Discharge pipe; 3. Electric oil valve; 4. Heating device; 5. Temperature sensor; 6. Viscosity sensor; 7. Central air injection pipe; 701. First spray hole; 702. Second spray hole; 8. Edge air injection pipe; 801. Third spray hole; 9. Air inlet pipe; 10. Air pump; 11. Air extraction pipe; 12. Concentration sensor; 13. Controller; 14. Guide plate; 15. Support rod; 16. Bottom air injection pipe; 1601. Fourth spray hole; 17. Solenoid flow valve. DETAILED DESCRIPTION

[0029] The following describes two implementation modes of the present application in detail with reference to the accompanying drawings.

[0030] The first implementation method:

[0031] Figures 1-9A system for rapidly and uniformly heating hot oil in a tanker liquid cargo is shown, comprising a heating mechanism fixedly mounted at the bottom of a liquid cargo tank 1 and a controller 13 equipped with a heating control system; the heating mechanism comprises a discharge pipe 2 fixedly connected to the shell wall of the liquid cargo tank 1 and extending at one end to the outside of the liquid cargo tank 1, an electric oil valve 3 fixedly connected to the outer end of the discharge pipe 2, a flow gap for crude oil to enter is formed between the end of the discharge pipe 2 away from the electric oil valve 3 and the inner wall of the liquid cargo tank 1, a heating device 4 fixedly connected to the shell wall of the discharge pipe 2; the central axis of the discharge pipe 2 A central gas injection pipe 7 extending to the outside of the liquid cargo tank 1 is provided at a position, and a portion of the central gas injection pipe 7 located in the discharge pipe 2 is provided with uniformly distributed first spray holes 701, the central gas injection pipe 7 is fixedly connected to the shell wall of the liquid cargo tank 1 and the outer end is connected to an air inlet pipe 9, the air inlet pipe 9 is connected to an air pump 10 fixed to the upper end surface of the liquid cargo tank 1, the air pump 10 is connected to the upper end of the inner cavity of the liquid cargo tank 1 through the air pump 11, and the air pump 10 injects the volatile oil gas accumulated on the top of the liquid cargo tank 1 into the central gas injection pipe 7 through the air pump 11 and the air inlet pipe 9;

[0032] See also Figure 4 and Figure 5 A plurality of edge gas injection pipes 8 are provided in the discharge pipe 2 and are circumferentially distributed and close to the inner wall of the discharge pipe 2. The ends of the edge gas injection pipes 8 are connected to the central gas injection pipe 7. The edge gas injection pipes 8 are provided with evenly distributed third spray holes 801.

[0033] See also Figure 3 The heating control system includes a control module, the input end of the control module is respectively connected with a temperature monitoring module, a viscosity monitoring module and a concentration monitoring module, the input end of the temperature monitoring module is connected with a temperature sensor 5, the temperature sensor 5 is fixed on the shell wall of the discharge pipe 2 near the side of the electric control oil valve 3, the input end of the viscosity monitoring module is connected with a viscosity sensor 6, the viscosity sensor 6 is fixed on the discharge pipe 2 and arranged opposite to the temperature sensor 5, the input end of the concentration monitoring module is connected with a concentration sensor 12 fixed on the top wall of the liquid cargo tank 1; the output end of the control module is respectively connected with a heating module, a gas filling module and a discharge module, the output end of the heating module is connected with a heating device 4, the output end of the gas filling module is connected with an air pump 10, and the output end of the discharge module is connected with the electric control oil valve 3.

[0034] For details, please refer to Figure 8 and Figure 9 , when performing unloading heating, the following steps are included:

[0035] Step 1: The controller 13 starts the heating device 4, which heats the crude oil in the discharge pipe 2, and uses the temperature sensor 5 and the viscosity sensor 6 to detect the temperature and viscosity of the crude oil in the discharge pipe 2. At the same time, the concentration sensor 12 is used to detect the concentration of volatile oil gas accumulated on the top of the liquid cargo tank 1;

[0036] Step 2: When the viscosity sensor 6 detects that the viscosity of the crude oil in the discharge pipe 2 reaches the set viscosity threshold, the controller 13 starts the electric control oil valve 3 to discharge the crude oil. When the real-time concentration of the crude oil is lower than the set minimum viscosity threshold, the electric control oil valve 3 is closed.

[0037] It should be noted that the outer end of the discharge pipe 2 is connected to the external unloading oil pump. When unloading, the electric control oil valve 3 and the external unloading oil pump are opened at the same time;

[0038] Step 3: While heating and unloading, when the concentration sensor 12 detects that the real-time concentration of the volatile oil gas accumulated on the top of the liquid cargo tank 1 is greater than the set concentration threshold, the air pump 10 is started, and the air pump 10 injects the volatile oil gas accumulated on the top of the liquid cargo tank 1 into the central air injection pipe 7 and the edge air injection pipe 8. When the real-time concentration of the volatile oil gas is lower than the set concentration threshold, the air pump 10 is turned off;

[0039] Specifically, the volatile oil gas is injected into the crude oil being heated in the discharge pipe 2 through the central gas injection pipe 7, and the refueling crude oil is stirred by the injected volatile oil gas flow, thereby improving the uniformity and heating efficiency of the crude oil heating in the discharge pipe 2; at the same time, the volatile oil gas is injected into the inner wall of the discharge pipe 2 through the edge gas injection pipe 8, thereby reducing the contact friction between the crude oil and the inner wall of the discharge pipe 2, improving the fluidity of the crude oil, and at the same time, reducing the concentration of the volatile oil gas accumulated on the top of the liquid cargo tank 1, thereby improving safety;

[0040] Step 4: during the gas injection operation, when the real-time viscosity of the crude oil is greater than the set maximum viscosity threshold, the heating power of the heating device 4 is reduced or the heating device 4 is turned off so that the real-time viscosity value is between the minimum viscosity threshold and the maximum viscosity threshold.

[0041] Specifically, the injected volatile oil gas is used to make the real-time viscosity of the crude oil meet the unloading requirements, and the energy saving effect is achieved by reducing the power of the heating device 4 or turning off the heating device 4.

[0042] Compared with the traditional liquid cargo tank heating system, the present invention is provided with an air pump 10 and a central air injection pipe 7 arranged in the discharge pipe, so as to inject the volatile oil gas accumulated on the top of the liquid cargo tank 1 into the discharge pipe 2, and perform air jet stirring on the crude oil being heated in the discharge pipe 2, thereby improving the fluidity of the crude oil, increasing the heat conduction efficiency inside the crude oil, improving the uniformity and heating efficiency of the heating, and reducing the concentration of the volatile oil gas formed by heating, thereby improving the safety of the heating operation; at the same time, by providing an edge air injection pipe 8 close to the edge of the discharge pipe 2, the volatile oil gas is sprayed on the inner wall of the discharge pipe 2, thereby reducing the friction between the crude oil and the inner wall of the discharge pipe 2, further improving the fluidity of the crude oil, and under the condition of meeting the viscosity of the crude oil unloading, reducing the output power of the heating device 4, thereby improving the energy efficiency.

[0043] See also Figure 5There are multiple first spray holes 701, and multiple first spray holes 701 distributed equidistantly around the circumference are opened on the circumferential side wall of the central gas injection pipe 7 at the same distance from the end thereof.

[0044] Specifically, through a plurality of groups of first spray holes 701 equidistantly distributed around the circumference, the jet airflow generated by the central air injection pipe 7 is fully dispersed in the discharge pipe 2, thereby improving the pneumatic stirring effect.

[0045] See also Figure 5 A portion of the central gas injection pipe 7 located in the flow gap is provided with a plurality of second spray holes 702 , and the second spray holes 702 are evenly distributed on the circumferential side wall of the central gas injection pipe 7 .

[0046] Specifically, the crude oil at the inlet of the discharge pipe 2 is stirred by air jet through the second spray hole 702 arranged at the flow gap position, thereby increasing the fluidity of the crude oil, making it easier for the unheated crude oil to enter the discharge pipe 2, and reducing the probability of blockage at the inlet of the discharge pipe 2.

[0047] See also Figure 5 There are multiple third spray holes 801 , which are evenly distributed along the axial direction of the edge gas injection pipe 8 and whose openings face the inner wall of the discharge pipe 2 .

[0048] Specifically, the spraying effect of the volatile oil gas flow sprayed from the third spray hole 801 on the inner wall of the discharge pipe 2 is improved, the friction and adhesion between the crude oil and the inner wall of the discharge pipe 2 are further reduced, and the fluidity of the crude oil is improved.

[0049] In this embodiment, the heating device 4 is a cylindrical heating plate or a spiral heating wire.

[0050] Specifically, the uniformity of heating is improved by using one of a cylindrical heating plate and a spiral heating wire.

[0051] Second implementation method:

[0052] Figure 2 , Figure 3 , Figure 7 and Figure 10 A system for quickly and evenly heating liquid cargo hot oil of an oil tanker is provided. On the basis of the first embodiment, the portion of the discharge pipe 2 located in the liquid cargo tank 1 is made of heat-conducting material, and a bottom gas injection pipe 16 fixedly connected to the liquid cargo tank 1 and extending to the outside of the liquid cargo tank 1 is provided below the discharge pipe 2. The bottom gas injection pipe 16 is provided with equidistantly distributed fourth spray holes 1601 along its axial direction, and the outer end of the bottom gas injection pipe 16 is connected with the air inlet pipe 9 and an electromagnetic flow valve 17 is provided at the connection point, and the electromagnetic flow valve 17 is connected to the output end of the gas filling module.

[0053] For details, please refer to Figure 10When the heating device 4 in the discharge pipe 2 is heating, the heat is transferred to the liquid cargo tank 1 through the heat-conducting shell wall of the discharge pipe 2, and the cold crude oil outside the discharge pipe 2 in the liquid cargo tank 1 is preheated. The crude oil outside the discharge pipe 2 expands due to the heat and its density decreases. The crude oil with a relatively high temperature outside the discharge pipe 2 is defined as high-temperature crude oil. The high-temperature crude oil will float upward due to the density difference and exchange heat with the low-temperature crude oil with a relatively low temperature located at the upper part. The low-temperature crude oil at the upper part will move downward due to the density difference, thereby improving the fluidity of the crude oil outside the discharge pipe 2 in the liquid cargo tank 1. At the same time, when performing gas injection operations, the electromagnetic flow valve 1 is opened. 7, so that the volatile oil gas is injected into the bottom gas injection pipe 16 and sprayed out from the fourth spray hole 1601, and the sprayed volatile oil gas pushes the high-temperature crude oil to move upward faster, thereby increasing the heat exchange efficiency between the high-temperature crude oil and the low-temperature crude oil, thereby improving the preheating effect, and further improving the heating effect on the crude oil; in addition, the electromagnetic flow valve 17 can control the injection amount of the volatile oil gas entering the bottom gas injection pipe 16 under the condition that the power of the vacuum pump 10 is known, that is, under the condition that the viscosity of the crude oil in the discharge pipe 2 is not affected, the preheating effect of the crude oil outside the discharge pipe 2 is improved; it should be noted that the discharge pipe 2 is made of metal heat-conducting material.

[0054] See also Figure 2 The discharge pipe 2 is a horizontally arranged hollow circular tube, and is arranged along the length direction of the liquid cargo tank 1. The bottom air injection pipe 16 is located directly below the discharge pipe 2 and is arranged parallel to it. The fourth spray hole 1601 is vertically facing the outer wall of the discharge pipe 2.

[0055] Specifically, the discharge pipe 2 arranged along the length direction of the liquid cargo tank 1 has a larger heating coverage range for the crude oil in the entire liquid cargo tank 1. At the same time, the volatile oil gas sprayed under the discharge pipe 2 better pushes the high-temperature crude oil heated by the discharge pipe 2 to move upward, further improving the preheating effect of the crude oil outside the discharge pipe 2, and increasing the overall fluidity of the crude oil in the liquid cargo tank 1.

[0056] See also Figure 2 and Figure 7 A group of relatively arranged guide plates 14 are provided on the outside of the discharge pipe 2, and a circulation heat exchange channel is formed between the group of guide plates 14 and the outer wall of the discharge pipe 2. The bottom air injection pipe 16 is located at the lower center position of the group of guide plates 14, and the lower end of the guide plate 14 is fixedly connected to the bottom plate of the liquid cargo tank 1 through a support rod 15.

[0057] See also Figure 7 The guide plate 14 includes an arc-shaped plate in the middle and vertical plates fixed on the upper and lower sides of the arc-shaped plate.

[0058] Specifically, by improving the heat exchange effect between the crude oil and the discharge pipe 2 and cooperating with the volatile oil gas discharged from the bottom gas injection pipe 16, the circulation heat exchange flow of the crude oil is further improved, and the speed and uniformity of heating the crude oil in the liquid cargo tank 1 are improved.

[0059] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A system for rapid and uniform heating of liquid cargo hot oil in oil tankers, characterized in that: It comprises a heating mechanism fixedly mounted on the bottom of a liquid cargo tank (1) and a controller (13) equipped with a heating control system; the heating mechanism comprises a discharge pipe (2) fixedly connected to the shell wall of the liquid cargo tank (1) and having one end extending to the outside of the liquid cargo tank (1); an electric oil control valve (3) is fixedly connected to the outer end of the discharge pipe (2); a flow gap for crude oil to enter is formed between the end of the discharge pipe (2) away from the electric oil control valve (3) and the inner wall of the liquid cargo tank (1); a heating device (4) is fixedly connected to the shell wall of the discharge pipe (2); A central air injection pipe (7) extending to the outside of the liquid cargo tank (1) is provided at the central axis position of the discharge pipe (2); the portion of the central air injection pipe (7) located inside the discharge pipe (2) is provided with uniformly distributed first spray holes (701); the central air injection pipe (7) is fixedly connected to the shell wall of the liquid cargo tank (1) and is connected to an air inlet pipe (9) at the outer end; the air inlet pipe (9) is connected to an air pump (10) fixed to the upper end surface of the liquid cargo tank (1); the air pump (10) is connected to the upper end of the inner cavity of the liquid cargo tank (1) through an air suction pipe (11); a plurality of edge air injection pipes (8) distributed in a circumference and close to the inner wall of the discharge pipe (2) are provided inside the discharge pipe (2); the ends of the edge air injection pipes (8) are connected to the central air injection pipe (7); and uniformly distributed third spray holes (801) are provided on the edge air injection pipes (8).

2. A system for rapid and uniform heating of liquid cargo hot oil for oil tankers according to claim 1, characterized in that: The heating control system comprises a control module, the input end of the control module is respectively connected to a temperature monitoring module, a viscosity monitoring module and a concentration monitoring module, the input end of the temperature monitoring module is connected to a temperature sensor (5), the temperature sensor (5) is fixed on the shell wall of the discharge pipe (2) close to the electric control oil valve (3), the input end of the viscosity monitoring module is connected to a viscosity sensor (6), the viscosity sensor (6) is fixed on the discharge pipe (2) and arranged opposite to the temperature sensor (5), and the input end of the concentration monitoring module is connected to a concentration sensor (12) fixed on the top wall of the liquid cargo tank (1); the output end of the control module is respectively connected to a heating module, a gas filling module and a discharge module, the output end of the heating module is connected to a heating device (4), the output end of the gas filling module is connected to an air pump (10), and the output end of the discharge module is connected to the electric control oil valve (3).

3. A system for rapid and uniform heating of liquid cargo hot oil for oil tankers according to claim 2, characterized in that: The portion of the discharge pipe (2) located inside the liquid cargo bin (1) is made of a heat-conducting material. A bottom gas injection pipe (16) is provided below the discharge pipe (2) and is fixedly connected to the liquid cargo bin (1) and extends to the outside of the liquid cargo bin (1). The bottom gas injection pipe (16) is provided with fourth spray holes (1601) distributed equidistantly along its axial direction. The outer end of the bottom gas injection pipe (16) is connected to the air inlet pipe (9) and an electromagnetic flow valve (17) is provided at the connection point. The electromagnetic flow valve (17) is connected to the output end of the gas filling module.

4. A system for rapid and uniform heating of liquid cargo hot oil for oil tankers according to claim 1, characterized in that: The number of the first spray holes (701) is multiple, and the central air injection pipe (7) is provided with multiple first spray holes (701) distributed equidistantly on the circumferential side wall at the same distance from the end thereof, and the central air injection pipe (7) is provided with multiple second spray holes (702) on the portion located in the flow gap, and the second spray holes (702) are distributed equidistantly on the circumferential side wall of the central air injection pipe (7).

5. The system for rapid and uniform heating of liquid cargo hot oil for oil tankers according to claim 1 is characterized in that: The number of the third spray holes (801) is plural, and the third spray holes (801) are evenly distributed along the axial direction of the edge gas injection pipe (8) and their openings face the inner wall of the discharge pipe (2).

6. The system for rapid and uniform heating of liquid cargo hot oil for oil tankers according to claim 1 is characterized in that: The heating device (4) adopts one of a cylindrical heating plate and a spiral heating wire.

7. A system for rapid and uniform heating of liquid cargo hot oil for oil tankers according to claim 3, characterized in that: The discharge pipe (2) is a horizontally arranged hollow circular tube and is arranged along the length direction of the liquid cargo tank (1). The bottom air injection pipe (16) is located directly below the discharge pipe (2) and is arranged parallel to it. The fourth spray hole (1601) is vertically facing the outer wall of the discharge pipe (2).

8. The system for rapid and uniform heating of liquid cargo hot oil for oil tankers according to claim 3 is characterized in that: A group of relatively arranged guide plates (14) are provided on the outside of the discharge pipe (2); a circulation heat exchange channel is formed between the group of guide plates (14) and the outer wall of the discharge pipe (2); a bottom air injection pipe (16) is located at the center of the lower part of the group of guide plates (14); and the lower end of the guide plate (14) is fixedly connected to the bottom plate of the liquid cargo tank (1) through a support rod (15).

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